| DOI: | 10.1002/2015GL065730
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| 论文题名: | North Atlantic meridional overturning circulation variations from GRACE ocean bottom pressure anomalies |
| 作者: | Landerer F.W.; Wiese D.N.; Bentel K.; Boening C.; Watkins M.M.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-8562
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| EISSN: | 1944-8293
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| 出版年: | 2015
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| 卷: | 42, 期:19 | | 起始页码: | 8114
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| 结束页码: | 8121
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| 语种: | 英语
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| 英文关键词: | AMOC
; GRACE
; gravity
; NADW
; ocean bottom pressure
; variability
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| Scopus关键词: | Climate change
; Geodetic satellites
; Gravitation
; AMOC
; Bottom pressures
; GRACE
; NADW
; variability
; Oceanography
; bottom pressure
; GRACE
; gravimetry
; gravity field
; heat flux
; meridional circulation
; North Atlantic Oscillation
; overturn
; pressure gradient
; satellite data
; seafloor
; spatiotemporal analysis
; water depth
; Atlantic Ocean
; Atlantic Ocean (North)
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| 英文摘要: | Concerns about North Atlantic Meridional Overturning Circulation (NAMOC) changes imply the need for a continuous, large-scale observation capability to detect changes on interannual to decadal time scales. Here we present the first measurements of Lower North Atlantic Deep Water (LNADW) transport changes using only time-variable gravity observations from Gravity Recovery and Climate Experiment (GRACE) satellites from 2003 until now. Improved monthly gravity field retrievals allow the detection of North Atlantic interannual bottom pressure anomalies and LNADW transport estimates that are in good agreement with those from the Rapid Climate Change-Meridional Overturning Circulation and Heatflux Array (RAPID/MOCHA). Concurrent with the observed AMOC transport anomalies from late 2009 through early 2010, GRACE measured ocean bottom pressures changes in the 3000-5000 m deep western North Atlantic on the order of 20 mm-H2O (200 Pa), implying a southward volume transport anomaly in that layer of approximately -5.5 sverdrup. Our results highlight the efficacy of space gravimetry for observing AMOC variations to evaluate latitudinal coherency and long-term variability. Key Points GRACE bottom pressure anomalies are used to infer AMOC-related LNADW variability 2003-2014 Very good agreement with in situ LNADW observations at 26.5N, with large -5.5 Sv anomaly in 2009/2010 LNADW variability at 26.5N well correlated with western boundary bottom pressure between 20 and 40N © 2015. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84946925114&doi=10.1002%2f2015GL065730&partnerID=40&md5=2e5f65da26a27545d29a84a3979545ae
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/8178
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| Appears in Collections: | 科学计划与规划
气候变化与战略
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作者单位: | Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States
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| Recommended Citation: | |
Landerer F.W.,Wiese D.N.,Bentel K.,et al. North Atlantic meridional overturning circulation variations from GRACE ocean bottom pressure anomalies[J]. Geophysical Research Letters,2015-01-01,42(19).
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